A dew shield is a device used to prevent moisture or condensation buildup on the lens of a camera or telescope collector during cool night observations. The dew shield either shades the lens or provides a small amount of warm air directly in front of the lens or collector to prevent dew from collecting on the element. Some dew shields work by using a heating element that keeps the objective lens warm enough to keep the dew from collecting.
Famous quotes containing the words dew and/or shield:
“A leaping tongue of bloom the scythe had spared
Beside a reedy brook the scythe had bared.
The mower in the dew had loved them thus,
By leaving them to flourish, not for us,
Nor yet to draw one thought of ours to him,
But from sheer morning gladness at the brim.”
—Robert Frost (1874–1963)
“Vice is its own reward. It is virtue which, if it is to be marketed with consumer appeal, must carry Green Shield stamps.”
—Quentin Crisp (b. 1908)